Turning accuracy and tolerance standards
Accuracy and tolerance standards
Turning accuracy refers to the extent to which the actual geometrical parameters (size, shape, and position) of the part are consistent with the ideal geometrical parameters. The difference between them is called the machining error. The size of the machining error reflects the level of machining accuracy. The larger the error is, the lower the machining accuracy is, and the smaller the error is, the higher the machining accuracy is. Kangding strict implementation of all products: GB/T1184-1996, GB T 25372-2010, GB/T1804-2000
(1) Linear dimensions: for example outer dimensions, inner dimensions, step dimensions, diameters, radii, distances, rounding radius and chamfer height;
(2) Angle dimensions: Include angle dimensions that do not normally indicate angle values, such as right angles (90°); linear and angular dimensions of the machined assembly.
Turning parts linear dimension limit deviation value
Tolerance level | 0~3 | >3~6 | >6~30 | >30~120 | >120~400 | >400~1000 | >1000~2000 | >2000 |
Precision (f) | ±0.01 | ±0.02 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 | — |
medium (m) | ±0.1 | ±0.1 | ±0.2 | ±0.3 | ±0.5 | ±0.8 | ±1.2 | ±2.0 |
Rough (c) | ±0.2 | ±0.3 | ±0.5 | ±0.8 | ±1.2 | ±2.0 | ±3.0 | ±4.0 |
Thickest (v) | — | ±0.5 | ±1.0 | ±1.5 | ±2.5 | ±4.0 | ±6.0 | ±8.0 |
Turning parts rounding radius and height dimensions of the chamfer limit deviation value
Tolerance level | 0~3 | 3~6 | >6~30 | >30 |
Precision (f) | ±0.2 | ±0.5 | ±1.0 | ±2.0 |
medium (m) | ||||
Rough (c) | ±0.4 | ±1.0 | ±2.0 | ±4.0 |
Thickest (v) |
Note: Refer to GB/T6403.4 for the meaning of rounding radius and chamfer height.
Limit deviation value of angular dimensions of turned parts
Tolerance level | 0~10 | >10~50 | >50~120 | 120~400 | >400 |
Precision (f) | ±1° | ±30′ | ±20′ | ±10′ | ±5′ |
medium (m) | |||||
Rough (c) | ±1°30′ | ±1° | ±30′ | ±15′ | ±10′ |
Thickest (v) | ±3° | ±2° | ±1° | ±30′ | ±20′ |
